Clock mechanism.



W. J. HERSGHEDE.

CLOCK MECHANISM. APPLICATION FILED JULY 19, 1912.

Patented Jan. 26, 1915.

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UNITED STATES PATENT OFFICE.

WALTER J'. HERSCHEDE, OF CINCINNATI, OHIO, ASSIGNOR TO HERSCHEDE HALL CLOCK COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

CLOCK MECHANISM.

Specification of Letters Patent.

Patented Jan. 26, 1915.

Application filed July 19, 1912. Serial No. 710,337.

To all whom it may concern Be it known that I, IVALTER J. Hnnsormon, a citizen of the United States of America, and resident of Cincinnati, county of Hamilton, and State of Ohio, have invented certain new and useful Improvements in Clock Mechanism, of which the following is a specification.

My invention relates to clock mechanism for actuating a lunar calendar in clocks.

The object of my invention is a mechanism which may be operated with a minimum expenditure of energy, will be subject to a minimum amount of repairing, and may be constructed at little expense.

Figure 1 is a front elevation of a dial plate, upon which a mechanism, embodying my invention is mounted, the dial plate being partially broken away to disclose the same. Fig. 2 is a side elevation of the same.

The dial plate A, the hour hand shaft B, the movement plate D, are of ordinary construction and need not therefore be particularly described.

Mounted securely eccentrically upon the hour hand shaft, between the dial plate and the movement plate, is a cam 72. An arm E is mounted at its upper end upon a pivot a, which projects rearwardly from the dial plate A. At its lower end, arm E has an elliptical slot 6, which embraces the cam b.

Mounted centrally upon the pin a is a disk G, which has upon its periphery a series of teeth 9'. Disk G has depicted upon its outer face two caricatures g g commonly used to represent the moon. Hence the disk G will be herein referred to as the lunar disk.

Pivoted upon the arm E is a finger e, which, at one end, has secured to it a weight 0 and at the other end has a pin 6 which 18 adapted to engage the teeth of the lunar disk. A finger K is pivoted upon the dial, has a pin is adapted to engage the teeth g, and a weight is adapted normally to hold the pin it in contact with the teeth. The finger K and the pin 76 are arranged in relation to the teeth g, so as to resist motion of the lunar disk in a contra-clock-wise direction.

In operation: The rotation of the hour hand shaft imparts one complete oscillation to the arm E every twelve hours. When the arm E moves from its most right-hand position to its most left-hand position, the pin 0 moves the lunar disk forward one step. When the arm E moves from its most lefthand position to its most right-hand position, the pin 6 rides up the inclined face 01 the next tooth and drops into the next notch at the base of that tooth. This action is accomplished by the weight 6 which rises to permit the pin 6 to ride up the inclined face of the tooth and causes the pin to drop into the next notch. The eccentricity of the cam b is made such, that upon each return move ment of the arm E, the pin 6 will engage in the next notch. The finger K prevents a contra-clock-wise movement of the lunar disk, so that the friction of the finger e upon the return movement of the arm E, does not cause the lunar disk to move backward. The teeth 9 are made of a number such that the moon face is moved across the opening A in the dial, in unison with the phases of the moon.

WVhat I claim is 1. In combination with a clock, a lunar disk j ournaled at a point above the dial thereof and provided with ratchet teeth on its periphery, a pendant arm having its upper end pivoted at a point above the lower edge of said disk, means on the hour wheel arbor engaging the depending end of said arm to swing said depending arm as said arbor rotates, a pawl carried by said arm at a point between its pivot and its engagement with said arbor, and a locking pawl.

2. In combination with a clock, a lunar disk journaled at a point above the dial thereof and provided with ratchet teeth on its periphery, a pendant arm having its upper end pivoted concentric with the axis of said disk, means on the hour wheel arbor engaging the depending end of said arm to swing said depending arm as said arbor rotates, said means consisting of an eccentric fitting a longitudinal slot in the arm whereby the arm will at all times be in engagement with said eccentric, a pawl carried by said arm at a point between its pivot and its engagement with said arbor, and a locking pawl.

WALTER J. HERSCHEDE.

Witnesses:

WALTER F. MURRAY, W. THORNTON Bocnn'r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. O. 

